"Isn't there a technology out there, that every time someone steps on it it creates a small electrical charge?

Could we maybe install that into the floors of our fortresses, and if we can manage it outside where the zombies are constantly shuffling around?"

"Not following where your going with this. You could set up an electric fence but I don't know how that would effect the undead. The wire would work best strung one foot off the ground. I've seen that example here before and always liked the idea. Tin cans with rocks to make an primitive alarm system (Also not my idea but a good one) would be more valuable than shocking something that doesn't feel pain.

You could shuffle your feet across a carpeted floor and zap them with static electricity too. Kidding, just kidding."

"... we could probably build a perpetual motion machine that generates electricity... of any charge. if we do that enough, we will have energy from literally nothing!

And giant hamster wheels... you mean the water wheels right? (or whatever they are called... the ones at places like grain mills...)

GO HAMSTER WHEELS!"